Method for estimating propagation loss, system for estimating propagation loss, device for estimating propagation loss, and program for estimating propagation loss

By defining virtual diffraction edges in outdoor wireless area evaluation, the method addresses computational inefficiencies in existing 3D CAD models, achieving accurate propagation loss estimation without additional computation time.

JP7882340B2Active Publication Date: 2026-06-30NIPPON TELEGRAPH & TELEPHONE CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NIPPON TELEGRAPH & TELEPHONE CORP
Filing Date
2022-10-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for outdoor wireless area evaluation, such as ray tracing using 3D CAD models, face significant computational load and time requirements due to the need for subdividing terrain and clutter, leading to inefficient computation.

Method used

A method that calculates outdoor propagation loss by defining virtual diffraction edges as intersections of straight lines with maximum slopes between base stations and terminals, allowing diffraction loss calculations without increasing computation time.

Benefits of technology

Enables highly accurate estimation of outdoor propagation loss without increasing computational resources, leveraging virtual diffraction edges to trace rays efficiently.

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Abstract

This disclosure relates to a propagation loss estimation method, a propagation loss estimation system, a propagation loss estimation device, and a propagation loss estimation program. This system is a propagation loss estimation method for calculating an outdoor propagation loss of a radio wave for each combination of a base station and a terminal. The propagation loss estimation method comprises creating an outdoor 3D CAD model, extracting a profile of data relating to terrain and clutter between the base station and the terminal from the outdoor 3D CAD model, calculating a virtual diffraction edge on the basis of the base station, the terminal, and the profile, and performing diffraction loss calculation for a radio wave passing through the virtual diffraction edge. Moreover, the virtual diffraction edge is an intersection between a straight line that has the maximum gradient when the base station is set to a start point and each point on the profile is set to an end point and a straight line that has the maximum gradient when the terminal is set to a start point and each point on the profile is set to an end point.
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